mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-19 00:41:43 +00:00
f84018af5f
During shared library loading, a different libLLVM can be pulled in, causing llvm symbols from dependent libraries to resolve to that library instead of this one. This has been seen in the wild with the Mesa OpenGL implementation in JavaFX applications (see wpilibsuite/shuffleboard#361). This is clearly a very breaking change. For some level of backwards compatibility, a namespace alias from llvm to wpi is performed in the "llvm" headers. Unfortunately, forward declarations of llvm classes will still break, but compilers seem to generate clear error messages in those cases ("namespace alias 'llvm' not allowed here, assuming 'wpi'"). This change also moves all the wpiutil headers to a single "wpi" subdirectory from the previously split "llvm", "support", "tcpsockets", and "udpsockets". Shim headers will be added for backwards compatibility in a later commit.
125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2016-2018 FIRST. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#ifndef CSCORE_HANDLE_H_
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#define CSCORE_HANDLE_H_
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#include <atomic>
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#include <memory>
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#include <utility>
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#include <wpi/StringRef.h>
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#include "UnlimitedHandleResource.h"
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#include "cscore_c.h"
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namespace cs {
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class SinkImpl;
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class SourceImpl;
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// Handle data layout:
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// Bits 0-15: Handle index
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// Bits 16-23: Parent index (property only)
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// Bits 24-30: Type
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class Handle {
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public:
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enum Type { kUndefined = 0, kProperty = 0x40, kSource, kSink, kListener };
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enum { kIndexMax = 0xffff };
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Handle(CS_Handle handle) : m_handle(handle) {} // NOLINT
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operator CS_Handle() const { return m_handle; }
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Handle(int index, Type type) {
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if (index < 0) {
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m_handle = 0;
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return;
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}
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m_handle = ((static_cast<int>(type) & 0x7f) << 24) | (index & 0xffff);
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}
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Handle(int index, int property, Type type) {
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if (index < 0 || property < 0) {
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m_handle = 0;
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return;
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}
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m_handle = ((static_cast<int>(type) & 0x7f) << 24) |
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((index & 0xff) << 16) | (property & 0xffff);
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}
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int GetIndex() const { return static_cast<int>(m_handle) & 0xffff; }
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Type GetType() const {
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return static_cast<Type>((static_cast<int>(m_handle) >> 24) & 0xff);
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}
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bool IsType(Type type) const { return type == GetType(); }
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int GetTypedIndex(Type type) const { return IsType(type) ? GetIndex() : -1; }
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int GetParentIndex() const {
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return IsType(Handle::kProperty) ? (static_cast<int>(m_handle) >> 16) & 0xff
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: -1;
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}
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private:
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CS_Handle m_handle;
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};
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struct SourceData {
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SourceData(CS_SourceKind kind_, std::shared_ptr<SourceImpl> source_)
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: kind{kind_}, refCount{0}, source{source_} {}
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CS_SourceKind kind;
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std::atomic_int refCount;
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std::shared_ptr<SourceImpl> source;
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};
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class Sources
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: public UnlimitedHandleResource<Handle, SourceData, Handle::kSource> {
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public:
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static Sources& GetInstance() {
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static Sources instance;
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return instance;
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}
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std::pair<CS_Source, std::shared_ptr<SourceData>> Find(
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const SourceImpl& source) {
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return FindIf(
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[&](const SourceData& data) { return data.source.get() == &source; });
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}
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private:
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Sources() = default;
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};
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struct SinkData {
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explicit SinkData(CS_SinkKind kind_, std::shared_ptr<SinkImpl> sink_)
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: kind{kind_}, refCount{0}, sourceHandle{0}, sink{sink_} {}
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CS_SinkKind kind;
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std::atomic_int refCount;
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std::atomic<CS_Source> sourceHandle;
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std::shared_ptr<SinkImpl> sink;
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};
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class Sinks : public UnlimitedHandleResource<Handle, SinkData, Handle::kSink> {
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public:
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static Sinks& GetInstance() {
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static Sinks instance;
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return instance;
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}
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std::pair<CS_Sink, std::shared_ptr<SinkData>> Find(const SinkImpl& sink) {
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return FindIf(
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[&](const SinkData& data) { return data.sink.get() == &sink; });
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}
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private:
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Sinks() = default;
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};
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} // namespace cs
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#endif // CSCORE_HANDLE_H_
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